A camera-control app for a cellphone that can recognize that the subject of the photograph is a dog, and override the "flash" setting.
This avoids (1) startling the dog, and (2) a photograph - however dim - without the "green eye" effect.
That is all.-- 8th of 7, Dec 15 2020 [kdf] that's a good thing because it would also work for those strange rat-like pseudo-dogs that some people seem to like.-- pocmloc, Dec 15 2020 Oh, those ... well, Chihuahuas already always look startled in their normal state, so the app would be redundant.-- 8th of 7, Dec 15 2020 Yes, but sometimes the user simply fails to perceive how low the ambient light levels actually are, and since the phone's camera app gives no indication that a flash will be needed, both photographer and subject can be startled by the unexpected light...-- 8th of 7, Dec 15 2020 The opposite would also be useful. This is a "kujo" filter. It would detect dog eyes and increase the red/magenta pixels to make them look like rabid snarling attack beasts.-- xenzag, Dec 16 2020 <Five minutes of mucking about with GIMP and a green-eyed Shih Tzu picture/>
No, just doesn't do it somehow...
[kdf], you're right about the preponderance of bad photographers, but part of the problem arises from the ubiquitousness of the technology. The same user who would think quite carefully about light, framing and angles when using a DSLR behaves quite differently for an impromptu shot with a phone, because it's such a fleeting opportunity. Often there isn't time to check the flash setting or the moment would be lost.
<Realizes that agreeing with [kdf] may indicate a major system fault/>
<Initiates full system diagnostic/>-- 8th of 7, Dec 16 2020 // Then I must shock you (and myself) by agreeing again //
Ah, that explains it. +++ ETERNAL DOMAIN ERROR +++, Incorrect Universe, please insert correct Universe and reboot.
<cancels diagnostic/>
// her upholstered rat in the far corner of the room, licking himself? //
Yeah, that's about right for younger brothers.-- 8th of 7, Dec 16 2020 random, halfbakery